CIRCULATION, BLOOD AXD GLANDS Veins of the Arm. In the Chimpanzee there is no basilic vein. The cephalic vein reaches as far as the antecubita! fossa, where it dips in and joins the vense coraites accompanying the branches of the brachial artery. There is a well-marked brachial vein instead of two vense coraites of the brachial artery as in Man. It passes upwards and is followed successively by the axillary and subclavian veins. These receive tributaries corresponding to the branches of the arteries. In the Gorilla there is likewise neither basilic nor humeral cephalic veins, and there is a brachial vein (Eisler). But Chapman describes basilic, cephalic, radial, ulnar and median veins (435''. In the Orang, Barkow figures a humeral cephalic vein dipping into the deltc-pectoral triangle, and I observed the same in a young animal. Veins of the Ley* In the Chimpanzee two venae coraites accompany the branches of the posterior tibial artery. These all unite to form the popliteal vein which is followed by the femoral vein. On the dorsum of the foot there is a venous arch as in Man. From its inner side one or two internal saphenous veins run upwards, pass under the sartorius and enter the femoral vein. One large external saphena vein runs up the back of the leg and joins the popliteal vein. No saphenous opening exists. In the other Apes the conditions are essentially the same as in * "Wittniann (299) has dealt with the portal vein, Keith (i$6) with the inferior vena cava, and Giacomini (67) with the veins of the leg.